A Lend Lease spokeswoman confirmed that a subcontractor employee was injured during a fall, and said the company was working closely with WorkCover investigators.

"The safety of our workers and the community is the number one priority for Lend Lease," she said.

Six safety breaches relating to major falls – through scaffolding, ceiling space and ladders – were identified among more than 60 serious incidents on Lend Lease sites in an internal company report obtained by Fairfax Media in April.

The Construction, Forestry, Mining and Energy Union is auditing all Lend Lease worksites under a national safety blitz.

Lend Lease chief executive Steve McCann recently called the union a ''disgrace'' and accused it of raising safety concerns on building sites as a distraction from the royal commission on union governance and corruption.

Union state secretary John Setka said it needed to ensure safety of workers following evidence of poor safety practices at Lend Lease sites.

"Their own leaked report ... showed they had 60 major health and safety violations in the past year alone," he said.

"This incident comes during a period when Lend Lease seems committed to watering down safety protections on their sites."

The site of the latest incident – the six-storey Monash translational research facility project – is bankrolled by $71 million of federal government funding.